1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
4 *
5 * Author: Lee Jones <lee.jones@linaro.org>
6 *
7 * This is a re-write of Christophe Kerello's PMU driver.
8 */
9
10#include <dt-bindings/interrupt-controller/irq-st.h>
11#include <linux/err.h>
12#include <linux/mfd/syscon.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/slab.h>
17
18#define STIH407_SYSCFG_5102 0x198
19
20#define ST_A9_IRQ_MASK 0x001FFFFF
21#define ST_A9_IRQ_MAX_CHANS 2
22
23#define ST_A9_IRQ_EN_CTI_0 BIT(0)
24#define ST_A9_IRQ_EN_CTI_1 BIT(1)
25#define ST_A9_IRQ_EN_PMU_0 BIT(2)
26#define ST_A9_IRQ_EN_PMU_1 BIT(3)
27#define ST_A9_IRQ_EN_PL310_L2 BIT(4)
28#define ST_A9_IRQ_EN_EXT_0 BIT(5)
29#define ST_A9_IRQ_EN_EXT_1 BIT(6)
30#define ST_A9_IRQ_EN_EXT_2 BIT(7)
31
32#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3)))
33#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3)))
34#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20)
35
36struct st_irq_syscfg {
37 struct regmap *regmap;
38 unsigned int syscfg;
39 unsigned int config;
40 bool ext_inverted;
41};
42
43static const struct of_device_id st_irq_syscfg_match[] = {
44 {
45 .compatible = "st,stih407-irq-syscfg",
46 .data = (void *)STIH407_SYSCFG_5102,
47 },
48 {}
49};
50
51static int st_irq_xlate(struct platform_device *pdev,
52 int device, int channel, bool irq)
53{
54 struct st_irq_syscfg *ddata = dev_get_drvdata(dev: &pdev->dev);
55
56 /* Set the device enable bit. */
57 switch (device) {
58 case ST_IRQ_SYSCFG_EXT_0:
59 ddata->config |= ST_A9_IRQ_EN_EXT_0;
60 break;
61 case ST_IRQ_SYSCFG_EXT_1:
62 ddata->config |= ST_A9_IRQ_EN_EXT_1;
63 break;
64 case ST_IRQ_SYSCFG_EXT_2:
65 ddata->config |= ST_A9_IRQ_EN_EXT_2;
66 break;
67 case ST_IRQ_SYSCFG_CTI_0:
68 ddata->config |= ST_A9_IRQ_EN_CTI_0;
69 break;
70 case ST_IRQ_SYSCFG_CTI_1:
71 ddata->config |= ST_A9_IRQ_EN_CTI_1;
72 break;
73 case ST_IRQ_SYSCFG_PMU_0:
74 ddata->config |= ST_A9_IRQ_EN_PMU_0;
75 break;
76 case ST_IRQ_SYSCFG_PMU_1:
77 ddata->config |= ST_A9_IRQ_EN_PMU_1;
78 break;
79 case ST_IRQ_SYSCFG_pl310_L2:
80 ddata->config |= ST_A9_IRQ_EN_PL310_L2;
81 break;
82 case ST_IRQ_SYSCFG_DISABLED:
83 return 0;
84 default:
85 dev_err(&pdev->dev, "Unrecognised device %d\n", device);
86 return -EINVAL;
87 }
88
89 /* Select IRQ/FIQ channel for device. */
90 ddata->config |= irq ?
91 ST_A9_IRQ_N_SEL(device, channel) :
92 ST_A9_FIQ_N_SEL(device, channel);
93
94 return 0;
95}
96
97static int st_irq_syscfg_enable(struct platform_device *pdev)
98{
99 struct device_node *np = pdev->dev.of_node;
100 struct st_irq_syscfg *ddata = dev_get_drvdata(dev: &pdev->dev);
101 int channels, ret, i;
102 u32 device, invert;
103
104 channels = of_property_count_u32_elems(np, propname: "st,irq-device");
105 if (channels != ST_A9_IRQ_MAX_CHANS) {
106 dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
107 return -EINVAL;
108 }
109
110 channels = of_property_count_u32_elems(np, propname: "st,fiq-device");
111 if (channels != ST_A9_IRQ_MAX_CHANS) {
112 dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
113 return -EINVAL;
114 }
115
116 for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
117 of_property_read_u32_index(np, propname: "st,irq-device", index: i, out_value: &device);
118
119 ret = st_irq_xlate(pdev, device, channel: i, irq: true);
120 if (ret)
121 return ret;
122
123 of_property_read_u32_index(np, propname: "st,fiq-device", index: i, out_value: &device);
124
125 ret = st_irq_xlate(pdev, device, channel: i, irq: false);
126 if (ret)
127 return ret;
128 }
129
130 /* External IRQs may be inverted. */
131 of_property_read_u32(np, propname: "st,invert-ext", out_value: &invert);
132 ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
133
134 return regmap_update_bits(map: ddata->regmap, reg: ddata->syscfg,
135 ST_A9_IRQ_MASK, val: ddata->config);
136}
137
138static int st_irq_syscfg_probe(struct platform_device *pdev)
139{
140 struct device_node *np = pdev->dev.of_node;
141 struct st_irq_syscfg *ddata;
142
143 ddata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*ddata), GFP_KERNEL);
144 if (!ddata)
145 return -ENOMEM;
146
147 ddata->syscfg = (unsigned int) device_get_match_data(dev: &pdev->dev);
148
149 ddata->regmap = syscon_regmap_lookup_by_phandle(np, property: "st,syscfg");
150 if (IS_ERR(ptr: ddata->regmap)) {
151 dev_err(&pdev->dev, "syscfg phandle missing\n");
152 return PTR_ERR(ptr: ddata->regmap);
153 }
154
155 dev_set_drvdata(dev: &pdev->dev, data: ddata);
156
157 return st_irq_syscfg_enable(pdev);
158}
159
160static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
161{
162 struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
163
164 return regmap_update_bits(map: ddata->regmap, reg: ddata->syscfg,
165 ST_A9_IRQ_MASK, val: ddata->config);
166}
167
168static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
169
170static struct platform_driver st_irq_syscfg_driver = {
171 .driver = {
172 .name = "st_irq_syscfg",
173 .pm = &st_irq_syscfg_pm_ops,
174 .of_match_table = st_irq_syscfg_match,
175 },
176 .probe = st_irq_syscfg_probe,
177};
178
179static int __init st_irq_syscfg_init(void)
180{
181 return platform_driver_register(&st_irq_syscfg_driver);
182}
183core_initcall(st_irq_syscfg_init);
184

source code of linux/drivers/irqchip/irq-st.c